Cholesteric liquid crystal light modulators
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[0032]As shown in FIG. 4, a field-induced blue shift in cholesteric liquid crystal is illustrated wherein the reflected wavelength is a function of applied voltage (a) and the reflectivity is a function of switched spectral wavelength (b). The reflective wavelength of the cholesteric liquid crystal is 695 nm with 45% reflectivity at zero voltage. As the voltage exceeds 15V, the pitches in the bulk are deformed by the voltage because of weak anchoring and thus, the pitches in the middle layers are extended. Consequently, the liquid crystal molecules in the bulk start to compress the pitches near the boundary layers so the pitches near the boundary layers are shortened. The spectral wavelength is switched to reflect a red at 16V with 25% reflectivity, green at 25V with 15% reflectivity and blue color at 40V with 12.5% reflectivity. Because the oriented liquid crystal molecules are no longer in a planar structure, the number of layers contributing to the reflectance decreases. Therefor...
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